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Knowing when and how to create an OSPF digital link is an essential ability for BSCI and CCNP test achievement, not forgetting how important it could be on your own work! As you realize the theory of virtual links, therefore let us take a look at just how to manage a virtual link, along with some real-world ideas that CCNP study courses and many CCNA leave out, a CCNA and CCNP choice! Within this configuration, no router with an interface in Area 4 features a physical interface in Area 0. What this means is a logical connection to Area 0, a virtual link, must be created. Be taught more on link emperor rankings by visiting our stirring link. Within the following example, R1 and R3 are adjacent and both have interfaces in Area 0. Be taught more on the affiliated article directory by clicking linkemperor. R4 has an adjacency with R3 via Area 34, but R4 has no bodily interface in Area 0 and is promoting its loopback 4.4.4.4 in to OSPF. R1 doesnt have the route to that loopback. R1#show ip address route ospf 6.0.0.0/32 is subnetted, 1 subnets E 6.6.6.6 [110/11] via 10.1.1.5, 01:05:45, Ethernet0 172.23.0.0/27 is subnetted, 1 subnets O IA 172.23.23.0 [110/74] via 172.12.123.3, 00:04:14, Serial0 7.0.0.0/32 is subnetted, 1 subnets O 7.7.7.7 [110/11] via 10.1.1.5, 01:05:45, Ethernet0 To eliminate this, a virtual link will be developed between R3 and R4 through Area 3-4. The area whereby the personal link is created, the transportation area, cant be a stub area of any kind. R4 config #router ospf 1 R4 config-router #area 34 virtual-link 3.3.3.3 R3 config #router ospf 1 2d07h: OSPF-4-ERRRCV: Received incorrect packet: mismatch area ID, from spine area should be virtual-link but not found from 172.23.23.4, Ethernet0 R3 config #router ospf 1 R3 config-router #area 3-4 virtual-link 4.4.4.4 R3 config-router #^Z 2d07h: OSPF-5-ADJCHG: Process 1, Nbr 4.4.4.4 o-n OSPF_VL0 from LOADING to FULL, Loading Done A few facts worth noting... the personal link command uses the distant devices RID, not necessarily the IP-ADDRESS on the interface thats in the transit area. Also, do not worry about that error communication you see in the output from R-3 that is usual and youll see it until you finish making the virtual link. Always confirm the personal link with show ip ospf virtual-link. The VL should show up in a matter-of seconds, when you have configured it properly. R3#show ip address ospf virtual-link Personal Link OSPF_VL0 to router 4.4.4.4 is up Run as need enterprise DoNotAge LSA helped. Discover additional resources on this related portfolio - Click here: http://www.linkemperor.com. Flow area 34, via program Ethernet0, Cost of using 10 Transmit Delay is 1 sec, State POINT_TO_POINT, Timer intervals configured, Hello 1-0, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:00 Adjacency State FULL Hello suppressed List 2/4, retransmission queue size 1, amount of retransmission 1 First 0x2C8F8E 15 /0x0 0 Next 0x2C8F8E 15 /0x0 0 Last retransmission scan size is 1, maximum is 1 Last retransmission scan time is 0 msec, optimum is 0 msec Link State retransmission due in 3044 msec Virtual links are in fact easy to configure, however for some reason they appear to intimidate people. It is my knowledge that the error message outlined in R3s production above causes plenty of anxiety, but the only factor that message means is that you are not finished making the virtual link yet. You can find three main misconfigurations that cause 99 of virtual link configuration issues: Using the wrong OSPF RID price Looking to use a stub area because the flow area Failure to configure link authentication on the personal link when Area 0 is running authentication That last one could be the one that gets ignored! A virtual link is actually an extension of Area 0, and the virtual link must be configured for it also, if Area 0 is running link validation. Look closely at the details. For one more viewpoint, you are encouraged to look at: http://linkemperor.com. dont anxiety when you see the error message on the next hub you arrange with the virtual link, and youll be ready for any virtual link condition on the task or within the CCNA / CCNP examination room!.